Firearm



Jan. 24-, 1939. c. H. BARNES in AL FIREARM Filed April 8, 1936 VIII/42.

. lll

INVENTORS. CHARLES .H..'BARNES.

OLIVER .H. LOOMIS.

Patented Jan. 24, 1939 UNITED STATES PATENT O FFl-CE FIREARM Application April 8; 1936, Serial No. 73,216

13 Claims.

This invention relatesto firearms, and contem'- plates an improved take-down mechanism for firearms of the type having a tubular magazine secured in the receiver, a barrel held in the receiver by an interrupted thread; and mechanism for removably joining the barrel-to the forward end of the tubular magazine. The invention relates particularly to this joining means, and contemplates novel-an-d very simple'devices whereby the barrel is firmly held regardless of the heating thereof under rapid firing but may be removed when desired by remarkably few and simple movements.

The common take-down for guns of this type comprises a member having a threaded connection with the'magazine and arranged to be advanced by rotation into engagement with a notched or recessed lug or other device extending from the barrel. In the older type devices a manipulative member was screwed forwardly until a part thereof snugly engaged a part fixed to the barrel. When a few shots are fired in rather rapid succession the barrel expands and the take-down joint is loosened. At times, means have been provided for engaging the barrel bya spring urged member to prevent such loosening due to temperature changes. Prior to the present invention, however, all such devices have included a member having a screw threaded connection with a part associated with the magazine and requiring a considerable amount of rotation for assembly and disassembly. Due to the proximity of the barrel to the manipulative element thus rotated, the necessity for rotation is undesirable, particularly where guns are being assembled and disassembled in the field in cold weather.

The present invention obviates the necessity for manipulating a screw threaded member in assembling and taking down the gun and, instead,

provides for such assembly and take-down by a simple longitudinally retractive movement of the take-down member coupled with a rotation of a few degrees only, which rotation takes place substantially automatically as an incident to the retractive movement.

In the drawing:

Fig. 1 is a fragmentary side elevation of a firearm embodying the invention.

Fig. 2 is an enlarged fragmentary elevation,

partly in section, of a portion of a barrel and a tubular magazine joined by devices embodying one form of the present invention.

Fig. 3 is a fragmentary sectional plan view, substantially on the line 33 of Fig. 2, showing the take-down mechanism after its initial retractive movement and in position to begin its short rotary movement.

Fig. 4 is a view similar to Fig. 3, showing the take-down mechanism fully retracted and disengaged from the barrel, leaving the barrel in posi- 51 tion to be rotated'and removed from the receiver.

Fig. 5 is a transverse section substantially on the line 55 of Fig. 2.

' The firearm comprises a receiver I0 having secured therein a tubular magazine II which may 10'- be partially encircled by a. fore-end l2 arranged to reciprocate on the magazine tube l I and constituting an operating handle for the breech mechanism. A barrel I3 is held in the receiver.

l8 by an interrupted thread indicated at M. At 15? a point immediately infront of the end of maga-- zine tube I I, a depending lug I5 is secured to. the barrel, said lug comprising a rearward face I6 and forwardly offset therefrom a second rearwardly facing surface ll. Projectingdownward- 1y from the left side of the lug adjacent the face I 6 is a rotation limiting foot 18. Projecting rearwar-dly from the face I6 is a fixed locating pin l9, and projecting rearwardly from the surface IT is a fixed take-down holding stud 20.

Secured near the forward end of the magazine tube H is a barrel receiving yoke member 2|, which preferably encircles the magazine tube and has projecting upwardly from its magazine tube encircling portion barrel supporting yoke fingers 22. The end of the magazine tube is partly closed by a bushing 23 which may be flanged against the end of the magazine tube as shown at 24 and is held in place by assembly pin 25; which pin is preferably screwed into the upper portion of the 35 yoke 2!, passes through aligned apertures in the upper and lower portions of bushing 23 and is received in locating apertures in the bottom of the magazine tubeand the yoke. Said bushing 23 may comprise a shoulder 26, serving as an abutment for a magazine spring 21, and an elongated boss 28, provided primarily for the purpose of furnishing an extended bearing surface for the take-down member to be described,

The take-down member, identified generally by 4d. the numeral 29, comprises a tubular portion slidably received in the aperture of bushing 23, a manipulative head 3Q preferably having a knurled edge, and a forwardly projecting hollow boss 3|. The end wall of boss 3! comprises an aperture or 50; recess conforming in shape to the take-down holding stud 2!]. As shown in the drawing, saidstud preferably comprises a conical portion and a substantially cylindrical tip projecting therefrom. In the upper portion of the take-down .5.;

head 30 is a circular aperture 32 adapted to receive the locating pin I9. The assembly pin 25 passes through L-shaped slots 33 in the tubular portion of the take-down member, which member is urged forward by a spring 34 compressed between the end wall of boss 3| and a head 35 of a spring pilot which abuts the assembly pin 25. The transversely extending portions of the L-slots 33 are of sufiicient width to permit the take-down member to be retracted until the locating pin I9 is disengaged from the aperture in the boss 3|. The forward margins of the L-slots 33 are rounded as shown at 36 to provide a camming engagement with the periphery of the assembly pin 25, which facilitates rotation of the take-down member to align the longitudinally extending portion of the L-slots with the assembly pin 25.

The operation of the mechanism is as follows:

Fig. 2 shows the gun assembled. The takedown member is urged forward by spring 34, securely engaging the take-down holding stud 23, and. held against rotation by engagement of locating pin H3 in aperture 32. To take the gun down, the take-down member is grasped and drawn rearwardly, the assembly pin 25 moving across the widened transversely extending portion of the L-slots 33. When the end of locating pin l9 has cleared the face of the take-down head 30, the take-down member may be rotated to bring assembly pin 25 into alignment with the longitudinally extending portion of the L- slots 33. Due to the rounded junction 36 between the transversely and longitudinally extending portions of the L-slots, the rotation of the takedown piece takes place substantially without conscious effort on the part of the operator. The take-down piece can now be moved rearwardly to disengage stud 20 from its recess in the boss 3| of the take-down member. The barrel may now be rotated a quarter turn to disengage the interrupted threads M by which it is held in the receiver, and drawn forward out of the receiver.

The re-assembling of the gun reverses the sequence of operations just described. The barrel is inserted in the receiver and given a quarter turn of rotation to bring the stud 29 into alignment with the aperture in the boss 3|. This rotative movement of the barrel into assembled position is stopped by the engagement of foot I8 on the barrel lug with margin 31 of a cut-out in the periphery of the take-down piece. The takedown member is then permitted to move forward until the locating pin l9 engages the face of the take-down head 38. The take-down member is then rotated to align the locating pin 9 with the aperture 32, foot l8 moving into a notch 38 which forms a transverse extension of the cut-out bounded by the marginal wall 31. When aperture 32 comes into alignment with pin IS, the take-down member snaps forward, securely engaging the conical portion of stud 26 in the correspondingly shaped aperture in the take-down member; thus, securely holding the gun assembled.

It will be understood that the invention is susceptible of embodiment in a variety of forms other than the one which has been selected for the purpose of illustration, all such forms falling within the scope of the appended claims.

What is claimed is:

1. A firearm comprising a receiver, a magazine tube rigidly and permanently secured to said receiver, a barrel held in said receiver by an interrupted thread and adapted for removal therefrom by rotation relative thereto, means for securing said barrel in place comprising a takedown member slidably and rotatably held on said magazine, a spring urging said take-down member forward with respect to said magazine, and inter-engaging devices on said take-down member and said barrel adapted for complete disengagement by a sequence of movements of said take-down member comprising an initial retraction, a short rotation, and a final retraction following said rotation.

2. A firearm comprising a receiver, a magazine tube rigidly secured to said receiver, a barrel held in said receiver by an interrupted thread and adapted for removal therefrom by rotation relative thereto, means for securing said barrel in place comprising a take-down member slidably and rotatably heldon said magazine, a spring urging said take-down member forward with respect to said magazine, inter-engaging devices on said take-down member and said barrel adapted for separation by an initial retraction of said take-down member, means for limiting said retraction and compelling a short rotation of said take-down member to permit final retraction thereof, and inter-engaging devices on said barrel and said take-down member adapted for separation by a final retraction of said take-down member after said limited rotation.

3. In a firearm comprising a receiver, a magazine tube rigidly secured in said receive-r, and a barrel removably held in said receiver; takedown mechanism comprising a magazine tube closing bushing, an assembly pin securing said bushing in said magazine tube, a take-down piece provided with a hollow boss received in said bushing and L-shaped slots receiving said assembly pin, and a spring urging said take-down piece forward and abutting said assembly pin.

4. A firearm comprising a receiver, a magazine tube rigidly secured in said receiver, and a barrel removably held in said receiver; a take-down member provided with a hollow boss slidably and rotatably held in said magazine, means for urging said member forward, a manipulative head on said member provided with an aperture, a forward extension on said boss provided with a recess, a lug on said barrel, a pin projecting from said lug adapted for engagement in said aperture, and a stud projecting from said lug adapted for engagement in said recess.

5. In a firearm comprising a receiver, a magazine tube rigidly secured in said receiver, and a barrel removably held in said receiver; a takedown device comprising a magazine tube closing bushing, an assembly pin securing said bushing in said magazine tube, a take-down member comprising a hollow boss received in said bushing and provided with L-slots for receiving said assembly pin, a manipulative head on said takedown member having an aperture therein, a forward extension on said boss having a recess therein, a lug on said barrel, a pin projecting rearwardly from said lug adapted for engagement in said aperture and for release therefrom by retraction of said take-down member, said retraction being limited by the engagement of said assembly pin with the margin of the. transversely extending portion of said L-slot, said marginbeing so. formed as to facilitate rotation of said take-down member to align the longitudinally extending portion of said L-slot with said assembly pin thereby permitting final retraction of said take-down member, a stud projecting rearwardly from said barrel lug to be receivedin the recess of said take-down member and disengaged therefrom by said final retraction of said take-down member.

6. In a firearm comprising a receiver, a magazine tube rigidly secured in said receiver, and a barrel held in said receiver and adapted for removal therefrom by rotation relative thereto; in combination, a take-down device associated with said magazine tube comprisng a take-down member slidably and rotatably held therein, 00- operating means on said barrel and said takedown member for preventing rotation of said take-down member until said member is initially retracted, cooperating devices on said barrel and said take-down member preventing rotation of said barrel for removal from said receiver after the disengagement of said cooperating means until a final retraction of said take-down member, and cooperating surfaces on said barrel and said take-down member for limiting the rotation of said barrel for assembly with said receiver.

7. In a firearm comprising a receiver, a magazine tube rigidly held in said receiver, and a barrel removably held in said receiver and adapted for assembly with and disassembly from said receiver by rotation therein; take-down mechanism comprising a lug on said barrel and a takedown member slidably and rotatably held in said magazine tube and arranged to be given an initial retraction, a short rotation, and a final retraction; cooperating surfaces on said take-down member and said barrel lug for limiting the assembly rotation of said barrel; cooperating means on said take-down member and said barrel lug for preventing rotation of said take-down member until said take-down member is initially retracted; and cooperating elements on said barrel lug and said take-down member for preventing disassembly rotation of said barrel Lmtil said take-down member is finally retracted.

8. In a firearm comprising a receiver, a magazine tube rigidly held in said receiver, and a barrel removably held in said receiver; a spring in said magazine tube, a magazine tube closing bushing forming an abutment for said spring, a bushing securing assembly pin, a take-down member comprising a hollow boss provided with L-slots which receive said assembly pin and limit the rotational and translational movements of said take-down member, a manipulative head on said take-down member, a forward extension on said boss comprising an end wall, and a spring interposed between said end wall and said assembly pin.

9. In a firearm comprising a receiver, a magazine tube rigidly held in said receiver, and a barrel removably held in said receiver; a spring in said magazine tube, a. magazine tube closing bushing forming an abutment for said spring, a bushing securing assembly pin, a take-down member comprising a hollow boss provided with L- slots which receive said assembly pin and limit the rotational and translational movements of said take-down member, a manipulative head on said take-down member, a forward extension on said boss comprising an end wall, a headed spring pilot abutting said assembly pin, and a take-down member spring interposed between the head of said pilot and said end wall.

10. A firearm comprising a receiver having a. magazine tube rigidly secured therein and a barrel adapted for assembly and disassembly therefrom by rotation relative thereto; a take-down member mounted for limited translational and rotational movements in said magazine tube, a lug secured to said barrel and comprising a rearward face having a pin projecting therefrom and adapted for rotation preventing cooperation with said take-down member, a rearwardly facing surface forwardly offset from said face and ha ing projecting therefrom a stud cooperating with said take-down member to prevent disassembly rotation of said barrel, and a foot on said lug adjacent said face adapted for cooperation with said take-down member to limit assembly rotation of said barrel.

11. A firearm comprising a receiver, a magazine tube rigidly and permanently secured to said receiver, a barrel held in said receiver by an interrupted thread and adapted for removal therefrom by rotation relative thereto, and means for securing said barrel to said magazine tube comprising a member slidably held in said magazine tube and having a limited rotation relativethereto, said means being adapted to release said barrel for rotation relative to said receiver by a sequence of rotational and translational movements thereof.

12. In a firearm comprising a receiver, a magazine tube rigidly secured in said receiver, and a barrel remo-vably held in said receiver; in combination, a take-down piece, means associated with said barrel comprising parts engaged by said take-down piece, said take-down piece comprising a boss slidably and rotatably received in said magazine tube, and a head provided with devices engaging said barrel means, one of said devices compelling a retraction of said take-down piece: prior to rotation thereof.

13. A firearm comprising a receiver, a magazine tube rigidly and permanently secured to said receiver, a barrel held in said receiver by an interrupted thread and adapted for removal therefrom by rotation relative thereto, and means for securing said barrel to said magazine tube; said means comprising a member which is slidably held in said magazine tube, has a limited rotation relative to the magazine tube, and is adapted to release said barrel by a sequence of movements comprising an initial retraction, a short rotation, and a final retraction.

CHARLES H. BARNES. OLIVER H. LOOMIS. 

